DVD to imovie
It is said that in order to use DVD content in imovie, we have to convert VOB files to MP4. What if the video files on the DVD are already in MP4 format?
MacBook Pro 13″, macOS 10.14
If it is a data DVD, versus an authored movie DVD, then the video files contained in it would be in whatever format in which they were recorded -- in this case Mp4. You can just copy-drag them out and drag them into the timeline of an iMovie project. However, not all Mp4 files work in iMovie. It must be Mp4/AAC. The AAC stands for Advanced Audio Coding. If the clips don't work in iMovie you can convert them to Mp4/AAC with the free download, Handbrake.
If you need to concert, you can get Handbrake here:
A simple way to do it is to open Handbrake and do a File/Open Source. Navigate to your video and choose it as the source from the resulting screen. Then do File/Start Encoding. Wait a couple of minutes for the conversion to complete. Then save and import the converted clip into iMovie. It should work fine.
-- Rich